Centrifugal brake



April 18, 1933. F. H. SCHWERIN 1,904,089

GENTRIFUGAL BRAKE Original Filed Dec. 5, 1929 /NVNTOR Y easy to assemble. l

.fully appear in the following description.

Patented Apr. 18, 1933Y vThis invention relates to improvements in centrifugal brakes or governors of the type in l.

which a pair of radially movable segmental lf In t e drawing forming a part `hereof:`

Fig. l lis a vertical cross-sectional view of the governor applied to a shaft; Y

Fig. 2 is a section on the line 2-7-2 of Fig.

1 1; and

segments 48.

Fig. 3 is a section on the line 3 3 of'Fig. 2.

In my Patent No. 1,837,137, dated Decem-` ber 15, 1931, of which this application is a v division, the brake now to be described and claimed'is shown applied to a shaft of a-selflowering jack. hile ularly adapted to this use, it may be employed 1 for other purposes.

In the form driven shaft 37 enters a housing 41y having mouth which is cylindrical, machined surface 42. The mouth is closed by a cap 43, having an inwardly projecting cylindrical flange 44, machined on the outside to fit the'machined surface v42 of the housing, andmachined on the inside to co operate with-the governor, as will presentlyv appear. The cap is held in place by screws` 45 Vand has a central boss 46, which affords a bearing for' one end of shaft 37.

The portion of the shaft within the cham- 41 is formed polygonally' toreceive a The simple and effective `construction pro-V vided for slidably securing thebrake segments to the disc,- to move easily. in,v right Y rthoi'igh it `would be V'central slots into the disc, to which the Shanks are riveted.

the brake is particshown, one end vof asuitably;

a, h provided with` an internal, ,7'

Vto insure sensitiveness, and

carrier y integral ribs on serial No. 573,765.Y

lines only., forms-an important feature of thel l invention. l

ormed in a face .of the disc, integral guiding ribs formed on adJacent faces and pins ments vfor retaining the segments on the. disc. Reversahof the grooves andribs asbetween the ysegments and the disc is; permissible,

less advantageous. n Ythe preferred form, the

segments each have an integral central rib 50 guided in the groove- VThe segments are loosely held to the 51,'theslianks of which pass 52 in the segments and their ribs The rib of each shoe fitting the grooveand acting `against the groove wall'serves to take up Vtangential strains. Y The shanks of pins passing Vthrough vslots in the seg' i outre-r face of .Y thedisc has a ,diametrical groove v49 and the disc by the heads of pins looselyl through 51 pass freely through the slots in the seg-V ments and ribs and serve solely segments on thedisc. to the f ments and the retaining' pins. construction is such as to to provide a speed governing l brake which is fected b y wear, and always certain in its action. In a brake of this character, reliability lis a primary consideration forvsuch purposes as the safe lowering of railroad cars. Likewise important is the elimination ofmaintenance expense andof losses due to inability to use the mechanism `to which the governor is applied.

The Aguiding of the segments on the disc or theone cooperating with grooves in the other contributes not only to maximum strength land dura-bilityA but also to compactness.VV V y Y ysoA The general minimize friction;l

practically unaf- "leo `substantially in .a

such jacks 'ceives aratchet wheel and socketed ratchet` lever.

` which is engaged ;gle tension springs are connected to the heads of the studs, within the recesses. Such a pair of floating springs gives a balanced effect. The means of connecting the springs in recesses of the segments causes them to act planeV with tlie`1.`segments and reduces the thickness of the governor.

A brake, such as described, is adapted to be advantageously used with self-lowering jacks such as that described in my copending application previously referred to.

a projecting operating shaft recase. The compact arrangement ofthe brake here 'described avoids the necessityy of iinduly prolonging the shaft to avoid vinterference lbetween the governor `and l'operating l/Vhen the governor is used with a selflowering jack, it is desirable to provide the housing el with ay downward' extension 57, the. lower end of which is formed with a vertical internally 1 screw-threaded opening,

bya hollow screw 58.

' screw is y formed with an externalA thumbn`rv vsoA Y`being provided with a groove in the segment piece 59, which Y beneath the '35 lies in a protected location extension 57.

A shaft is pinned atl to the outer end of the screw V58, and projects for a distance beyond the inner end of the screw. The inner end of this shaft has al head 62,-Which re v I v tains a manually operated '4.0

By means of the segment may be set against the disc 47, in Order to keep descending, l.or can be freed allow the load to lower. Y

This manually operated brake forms no part of the present invention and is moreV particularly prior Patent 1926.

' I claim:

V1. In a centrifugal brake, a `rotary disc, and a brake segment, one of said members and thel other the groove to of the segment with respect a pin passing through a slot No. 1,579,788, dated with a guiding rib slidable in revent vturning to the disc, and

` in the groove.

2. ln a centrifugal brake, a rotary disc having a groove, a pair of segments provided with integral ribs slidable in the groove to prevent turning of the segments with respect lto the disc, and a pin passing through a slot in each segment and fixedl lto the disc brake segment 63, the shaft being swivel'ed in thesegment.,. thumb-piece 59, the brakeV the periphery of' Vthe load yfromY from the disc tol described and claimed in my f vApril 6,'

for retaining the guiding rib Y Y ing in which is ,an` opening;

for retaining the respective ,ribs in the groove. v

3. In a centrifugal brake, a rotary disc having adiametrical groove in one face, a pair of segments each provided withV an integral central rib slidable'in said groove for withstanding the tangential braking strain, each-segment having ajslot, and a headed pin for retaining each segment on Vthe disc, the 'sha-nk of each pin being fixed to the disc and passing freely through one of said slots so that the pin is not subject to the tangential braking strain. Y f f 1 4. In av centrifugal brake, a rotary disc having a dia-metrical groove in one face, a pair of segments each having a central integral ribslidable in the groove for Vwith- .'segment and rib having 'a central slot eX- tending transversely and rib, and a headed pin for retaining each Y segment on the disc, each pin being fiXed to the disc and Vpassing freely through oneof said slotsV so that theutangentialgbraking strain. y

5l A centrifugal brake comprising a rotary disc-provided with'agroove, appair of segments each having a rib slidable in the groove, a pin passing through a slot in each segment and fixed to the disc, having a recessl at each end, studslmounted in the recesses, and a pair of springs the opposite' ends of which are connected in said recess to the said studs.

6. Acentrifugal rbrake comprising ro-1.- A:ta-ry 4disc having a diametrical groove in one face, a pair of segments each having an integralcentral rib slidable in the groove for withstanding the tangential braking strain,

each seg-ment and rib provided Vwith a ceni tral slot V.passing transversely through the segment and rib, a headed pin passing freely through each slot'and fixed to the disc, `each ysegmentbeing provided with a recess at .each end, studs mounted in the recesses, 'and a pairl of tension springs connected at opposite ends to the studs.v l l 7 A; centrifugal tary disc, -a pair move-ment in right disc, -each ofl said segments with recesses in its outer face, said segments with their heads in saidA recesses, and a pair ofsprings connecting said 'segments with each other, the opposite ends ofv said springs being connected -with'in said recesses withl lie-heads of said studs. l

`8. A centrifugal brake comprising` a housbrake, comprising a r-oof segments guided for being formed studs fixed in the housingandclosing said opening; a shaft in the housing with one end journaled in the cap; a brake surface carried by the cap and lextending within the housing substantially parallel andi-spaced fromthe shaft; a -disc lon the shaft; and brake segments carri-ed by through the segr-nentiA 4the pin is not subject tov each segment" lines on the face ofsaida cap secured to standing the tangential braking strain, each l the disc and rectilinearly movable, with re- Y spect to the disc, into contact with the brake surface.

9. A brake including, housing; :L rotary shaft a brake surface fixed to trifugal brake including a' disc carriedV by the shaft; brake segments carried `by the disc,

in combination, a. Within the housing;

a rib on each brake segment slidable in a groove. in the disc so that the bra-ke segments will move by centrifugal force into contact v with the brake surface in the housing, said preventing the segment from rib and groove being moved by the tangential braking force; a, headed pin extending through a slot in each brake segment and secured to the dise for retaining the rib Within the groove; and a manual brake connected with the housing and operable into Contact with the disc.

FRANK H. SCHWERIN.

the housing; a cen- 

